From 4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Tue, 9 Apr 2024 15:34:27 +0200 Subject: Adding upstream version 1:2.43.0. Signed-off-by: Daniel Baumann --- compat/win32mmap.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 compat/win32mmap.c (limited to 'compat/win32mmap.c') diff --git a/compat/win32mmap.c b/compat/win32mmap.c new file mode 100644 index 0000000..519d51f --- /dev/null +++ b/compat/win32mmap.c @@ -0,0 +1,46 @@ +#include "../git-compat-util.h" + +void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset) +{ + HANDLE osfhandle, hmap; + void *temp; + LARGE_INTEGER len; + uint64_t o = offset; + uint32_t l = o & 0xFFFFFFFF; + uint32_t h = (o >> 32) & 0xFFFFFFFF; + + osfhandle = (HANDLE)_get_osfhandle(fd); + if (!GetFileSizeEx(osfhandle, &len)) + die("mmap: could not determine filesize"); + + if ((length + offset) > len.QuadPart) + length = xsize_t(len.QuadPart - offset); + + if (!(flags & MAP_PRIVATE)) + die("Invalid usage of mmap when built with USE_WIN32_MMAP"); + + hmap = CreateFileMapping(osfhandle, NULL, + prot == PROT_READ ? PAGE_READONLY : PAGE_WRITECOPY, 0, 0, NULL); + + if (!hmap) { + errno = EINVAL; + return MAP_FAILED; + } + + temp = MapViewOfFileEx(hmap, prot == PROT_READ ? + FILE_MAP_READ : FILE_MAP_COPY, h, l, length, start); + + if (!CloseHandle(hmap)) + warning("unable to close file mapping handle"); + + if (temp) + return temp; + + errno = GetLastError() == ERROR_COMMITMENT_LIMIT ? EFBIG : EINVAL; + return MAP_FAILED; +} + +int git_munmap(void *start, size_t length) +{ + return !UnmapViewOfFile(start); +} -- cgit v1.2.3